Alzheimer's disease: 6th leading cause of death in the US. 16.1 million Americans provide 18.4 billion hours of unpaid care for people with dementia. Between 2000 and 2015 heart disease deaths decreased 11% while Alzheimer's disease deaths increased 123%. 1 in 3 seniors dies with Alzheimer's or other dementia; it kills more than breast and prostate cancer combined. Early diagnosis could save up to $7.9 trillion.